1. 7-1
One of the Goals of Interest Rate Hedging: Protect the Net Interest Margin (continued)
We calculate a firm’s net interest income to see how it will change if interest rates rise
Net interest income can be derived from the following formula
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2. 7-2
One of the Goals of Interest Rate Hedging: Protect the Net Interest Margin (continued)
A useful overall measure of interest rate risk exposure is the cumulative gap
The total difference in dollars between those assets and liabilities that can be repriced over a designated period of time
Given any specific change in market interest rates, we can calculate approximately how net interest income will be affected by an interest rate change
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3. 7-3
One of the Goals of Interest Rate Hedging: Protect the Net Interest Margin (continued)
Problems with Interest-Sensitive GAP Management
Interest paid on liabilities tend to move faster than interest rates earned on assets
The interest rate attached to bank assets and liabilities do not move at the same speed as market interest rates
The point at which some assets and liabilities are repriced is not easy to identify
The interest-sensitive gap does not consider the impact of changing interest rates on equity positions
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4. TABLE 7–2 Eliminating an Interest-Sensitive Gap
7-4
TABLE 7–2 Eliminating an Interest-Sensitive Gap
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5. The Concept of Duration as a Risk-Management Tool
7-5
The Concept of Duration as a Risk-Management Tool
Duration is a value-weighted and time-weighted measure of maturity that considers the timing of all cash inflows from earning assets and all cash outflows associated with liabilities
Measures the average maturity of a promised stream of future cash payments or
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6. The Concept of Duration as a Risk-Management Tool (continued)
7-6
The Concept of Duration as a Risk-Management Tool (continued)
The net worth (NW) of any business or household is equal to the value of its assets less the value of its liabilities
As market interest rates change, the value of both a financial institution’s assets and its liabilities will change, resulting in a change in its net worth
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7. The Concept of Duration as a Risk-Management Tool (continued)
7-7
The Concept of Duration as a Risk-Management Tool (continued)
Portfolio theory teaches us that
A rise in market rates of interest will cause the market value (price) of both fixed-rate assets and liabilities to decline
The longer the maturity of a financial firm’s assets and liabilities, the more they will tend to decline in market value (price) when market interest rates rise
By equating asset and liability durations, management can balance the average maturity of expected cash inflows from assets with the average maturity of expected cash outflows associated with liabilities
Thus, duration analysis can be used to stabilize, or immunize, the market value of a financial institution’s net worth
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8. The Concept of Duration as a Risk-Management Tool (continued)
7-8
The Concept of Duration as a Risk-Management Tool (continued)
The important feature of duration from a risk-management point of view is that it measures the sensitivity of the market value of financial instruments to changes in interest rates
The percentage change in the market price of an asset or a liability is equal to its duration times the relative change in interest rates attached to that particular asset or liability
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9. The Concept of Duration as a Risk-Management Tool (continued)
7-9
The Concept of Duration as a Risk-Management Tool (continued)
The relationship between an asset’s change in price and its change in yield or interest rate is captured by a key term in finance that is related to duration – convexity
Convexity refers to the presence of a nonlinear relationship between changes in an asset’s price and changes in market interest rates
It is a number designed to aid portfolio managers in measuring and controlling the market risk in a portfolio of assets
An asset or portfolio bearing both a low duration and low convexity normally displays relatively small market risk
Convexity increases with the duration of an asset
It tells us that the rate of change in any interest-bearing asset’s price (market value) for a given change in interest rates varies according to the prevailing level of interest rates
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10. Using Duration to Hedge against Interest Rate Risk
7-10
Using Duration to Hedge against Interest Rate Risk
A financial-service provider interested in fully hedging against interest rate fluctuations wants to choose assets and liabilities such that
so that the duration gap is as close to zero as possible
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11. Using Duration to Hedge against Interest Rate Risk (continued)
7-11
Using Duration to Hedge against Interest Rate Risk (continued)
Because the dollar volume of assets usually exceeds the dollar volume of liabilities, a financial institution seeking to minimize the effects of interest rate fluctuations would need to adjust for leverage
Equation (7-21) states that the value of liabilities must change by slightly more than the value of assets to eliminate a financial firm’s overall interest-rate risk exposure
The larger the leverage-adjusted duration gap, the more sensitive will be the net worth (equity capital) of a financial institution to a change in interest rates
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12. Using Duration to Hedge against Interest Rate Risk (continued)
7-12
Using Duration to Hedge against Interest Rate Risk (continued)
Expanding the balance sheet relationship of Equation (7–17)
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13. Using Duration to Hedge against Interest Rate Risk (continued)
7-13
Using Duration to Hedge against Interest Rate Risk (continued)
Suppose a bank holds the following portfolio of assets and their corresponding durations
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14. Using Duration to Hedge against Interest Rate Risk (continued)
7-14
Using Duration to Hedge against Interest Rate Risk (continued)
Weighting each asset duration by its associated dollar volume, we can calculate the duration of the asset portfolio as:
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15. Using Duration to Hedge against Interest Rate Risk (continued)
7-15
Using Duration to Hedge against Interest Rate Risk (continued)
The impact of changing market interest rates on net worth can be described as:
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16. The Limitations of Duration Gap Management
7-16
The Limitations of Duration Gap Management
Finding assets and liabilities of the same duration can be difficult
Some assets and liabilities may have patterns of cash flows that are not well defined
Customer prepayments may distort the expected cash flows in duration
Customer defaults may distort the expected cash flows in duration
Convexity can cause problems
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17. 7-17
Quick Quiz
What do the following terms mean: asset management? liability management? funds management?
What is the yield curve, and why is it important to know about its shape or slope?
Can you explain the concept of gap management?
When is a financial firm asset sensitive? Liability sensitive?
Explain the concept of weighted interest-sensitive gap. How can this concept aid management in measuring a financial institution’s real interest-sensitive gap risk exposure?
What is duration? How is a financial institution’s duration gap determined?
What are the advantages of using duration as opposed to interest-sensitive gap analysis?
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